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Fault-induced gear meshing modulation sideband extraction and evaluation for fault diagnosis of planetary gearboxes

Science China Technological Sciences 2025年第1期 339-355页

作者： peng zhou Xiaoluo YU Yang YANG Qingbo HE Zhike peng State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Science and Technology on Vehicle Transmission Laboratory China North Vehicle Institute School of Mechanical Engineering Ningxia University

Gearboxes, known for their compact size and stable transmission capability, are widely used as power transmission structures in various types of mechanical equipment, such as wind turbines, helicopters, and special vehicles. However, due to harsh and non-stationary working conditions, gear surfaces often deteriorate, leading to faults such as wear, pitting, and cracking. Therefore, it is vital to monitor the working status of gearboxes and diagnose gear faults as early as possible. Gear faults can induce characteristic modulation effects near the gear meshing frequency(GMF), resulting in the appearance of faultinduced sidebands in a vibration spectrum. Extraction of these sidebands allows for the diagnosis of gear faults in a ***, when faced with a planetary gearbox having a complex configuration, strong background noise and additional faultunrelated sidebands can interfere with fault-induced sidebands, making accurate diagnosis difficult. To address these challenging issues, this paper proposes a novel fault-induced gear meshing modulation sideband extraction method. In the process,the sidebands directly related to the gear fault near the GMF are first identified and then extracted by a variational harmonic mode decomposition(VHMD) method. Accordingly, a fault-related gear meshing modulation component(GMMC) can be accurately reconstructed by summing up the extracted fault-induced sidebands. Using the GMMC, the gear fault severity can be assessed by evaluating its amplitude modulation(AM) effect. The superior performance of the proposed method is finally demonstrated by experimental data.

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Coupling effects between elastic and electromagnetic fields from the perspective of conservation of energy

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Applied Mathematics and Mechanics(English Edition) 2021年第11期42卷 1649-1662页

作者： peng zhou Department of Mechanics Harbin Institute of TechnologyHarbin 150001China

Coupling effects among different physical fields reflect the conversion of energies from one field into another *** simple physical processes,their governing or constitutive equations all satisfy the law of conservation of energy(LCE).Then,an analysis is extended to the coupling ***,for the linear direct and converse piezoelectric and piezomagnetic effects,their constitutive equations guarantee that the total energy is conserved during the process of energy conversion between the elastic and electromagnetic ***,the energies are converted via the work terms,(βijkEi),kvj and(γijkHi),kvj,rather than via the energy terms,βijkEiejk andγ***,for the generalized Villari effects,the electromagnetic energy can be treated as an extra contribution to the generalized elastic ***,for electrostriction and magnetostriction,both effects are induced by the Maxwell ***,their energies are purely electromagnetic and thus both have no converse *** these processes,the energies can be converted in three different ways,i.e.,via the non-potential forces,via the cross-dependence of the energy terms,and directly via the electromagnetic interactions of ions and *** the end,the general coupling processes which involve elastic,electromagnetic fields and diffusion are also *** advantages of using this energy formulation are that it facilitates discussion of the conversion of energies and provides better physical insights into the mechanisms of these coupling effects.

关键词： piezoelectricity piezomagnetism Villari effect electrostriction magnetostriction

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爆炸切割网络传爆中的间隙与角度效应

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火工品 2025年第1期 37-43页

作者：周晓鹏姜勇袁航中国船舶集团有限公司第七一三研究所河南郑州450015 河南省水下智能装备重点实验室河南郑州450015

为研究爆炸切割网络中传爆节点处传爆能力的关键影响因素,通过改变切割索对传爆药柱的传爆间隙进行了平板传爆试验,将试验结果结合仿真分析确定了JO-11C传爆药柱的仿真材料参数,并进一步分析了传播角度对传爆能力的影响。研究结果表明:... 详细信息

为研究爆炸切割网络中传爆节点处传爆能力的关键影响因素,通过改变切割索对传爆药柱的传爆间隙进行了平板传爆试验,将试验结果结合仿真分析确定了JO-11C传爆药柱的仿真材料参数,并进一步分析了传播角度对传爆能力的影响。研究结果表明:随着传爆间隙的增加,传爆能力下降,切割索对传爆药柱的最大传爆间隙区间为2.0~2.5 mm;同时,传爆角度的增大能够显著提高传爆能力。本研究为爆炸切割网络的传爆性能研究以及提高武器系统的可靠性提供了参考。

关键词：爆炸切割网络传爆间隙传爆角度传爆药柱仿真分析

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Gαi蛋白在恶性肿瘤中的研究进展

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医学综述 2025年第1期31卷 34-40页

作者：陈林周鹏苏州大学附属第三医院常州市第一人民医院神经外科江苏常州213003

恶性肿瘤的发生与细胞信号转导紊乱密切相关。G蛋白家族中的Gαi蛋白作为信号转导的重要参与者,在脑胶质瘤、骨肉瘤、乳腺癌和前列腺癌等恶性肿瘤中存在异常表达或活性改变。目前认为,Gαi蛋白在肿瘤的发生和发展过程中发挥作用,可能通... 详细信息

恶性肿瘤的发生与细胞信号转导紊乱密切相关。G蛋白家族中的Gαi蛋白作为信号转导的重要参与者,在脑胶质瘤、骨肉瘤、乳腺癌和前列腺癌等恶性肿瘤中存在异常表达或活性改变。目前认为,Gαi蛋白在肿瘤的发生和发展过程中发挥作用,可能通过调控细胞增殖、迁移和凋亡等途径参与癌变机制,这为靶向Gαi蛋白的个性化治疗提供了理论依据。未来的研究可以进一步探讨Gαi蛋白的具体分子机制及其在临床治疗中的应用潜力,为新型靶向药物的开发提供指导。

关键词：恶性肿瘤 Gαi蛋白胶质瘤骨肉瘤乳腺癌前列腺癌

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In situ polymerization of poly(3,4-ethylenedioxythiophene)protective layer towards stable zinc anode

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Nano Research 2025年第1期18卷 382-394页

作者： Debin Luo peng zhou Xiaowei Lv Panpan Sun Xiaohua Sun Hewei Zhao College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China Hubei Three Gorges Laboratory Yichang 443007China School of Chemistry Beihang UniversityBeijing 100191China

Aqueous zinc-ion devices are considered promising candidates for energy storage due to their high safety,low cost and relatively high energy ***,the dendrite growth,hydrogen evolution reaction(HER)and corrosion of the zinc anode significantly limit the development of Zn-ion ***,an inexpensive poly(3,4-ethylenedioxythiophene)(PEDOT)protective layer was constructed in situ on the Zn surface using electropolymerization to suppress dendrite growth and side reactions,thereby enhancing the reversibility of *** and theoretical calculations revealed that this hydrophilic protective layer promotes the desolvation process of hydrated Zn^(2+)and facilitates the transport of zinc ions,thus improving the thermodynamic and kinetic properties of Zn^(2+)deposition and inhibiting interfacial side ***,the optimized PEDOT@Zn symmetric battery exhibited a cycling stability exceeding 1250 h at 0.5 mA·cm^(-2)and 0.25 mAh·cm^(-2),with a significantly reduced overpotential(from 91.8 to 35 mV).With the assistance of the PEDOT protective layer,the PEDOT@Zn//Cu battery maintained approximately 99.5%Coulombic efficiency after 450 ***-situ scanning electron microscopy(SEM)and in situ optical microscopy characterizations further confirmed that the PEDOT protective layer can effectively suppress the growth of zinc ***,the Zn-ion capacitors assembled by the PEDOT@Zn and activated carbon also demonstrated outstanding cycling stability.

关键词： zinc-ion devices zinc anode poly(3 4-ethylenedioxythiophene)(PEDOT) dendrite desolvation process

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Fast and Robust Stereo Vision Algorithm for Obstacle Detection

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Journal of Bionic Engineering 2008年第3期5卷 247-252页

作者： Yi-peng zhou Department of Automation Northwestern Polytechnic University Xian 710068 P. R. China

Binocular computer vision is based on bionics, after the calibration through the camera head by double-exposure image synchronization, access to the calculation of two-dimensional image pixels of the three-dimensional depth information. In this paper, a fast and robust stereo vision algorithm is described to perform in-vehicle obstacles detection and characterization. The stereo algorithm which provides a suitable representation of the geometric content of the road scene is described, and an in-vehicle embedded system is presented. We present the way in which the algorithm is used, and then report experiments on real situations which show that our solution is accurate, reliable and efficient. In particular, both processes are fast, generic, robust to noise and bad conditions, and work even with partial occlusion.

关键词： stereo vision vehicle dynamics visibility range image alignment

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Electrochemical transformation of biomass-derived oxygenates

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Science China Chemistry 2023年第4期66卷 1011-1031页

作者： peng zhou Jie Zhang School of Chemistry Monash UniversityClaytonVictoria 3800Australia

Replacing conventional fossil resources with renewable raw materials for chemical production and energy generation is crucial for achieving the carbon-neutral goal and alleviating the emerging energy *** has been considered as one of the most promising candidates for this purpose owing to its great natural abundance and inherent ability to fix CO_(2) in the form of multicarbon ***,biomass conversion through an electrochemical route is intriguing because of its operability near ambient conditions,flexible scalability(suitable for distributed manufacturing and even domestic use)and green generation of oxidative or reductive equivalents instead of wasteful and possibly explosive or flammable ***,recent progress in electrochemical transformation of biomass,including hydrogenation and amination,is reviewed with the emphasis on catalysts and strategies for enhancing catalytic *** advances in mechanistic understanding using in-situ spectroscopy are also briefly ***,recommendations for the directions for future development are also provided.

关键词： biomass utilization electrochemical hydrogenation reductive amination catalyst in-situ spectroscopy mechanism

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A new type of damper with friction-variable characteristics

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Earthquake Engineering and Engineering Vibration 2009年第4期8卷 507-520页

作者： zhou Xiyuan peng Lingyun Beijing Key Lab of Earthquake Engineering and Structural Retrofit Beijing University of Technology Beijing 100124. China

Professor T. T. Soong is one of the early pioneers in field of earthquake responsc control of structures. A new type of smart damper, which is based on an Energy Dissipating Restraint （EDR）, is presented in this paper. The EDR by Nims and Kelly, which has a triangle hysteretic loop, behaves like an active variable stiffness system （AVS） and possesses the basic characteristics of a linear viscous damper but has difficulty in capturing the output and large stroke simultaneously needed for practical applicataions in engineering structures. In order to overcome this limitation, the friction surface in the original Sumitomo EDR is divided into two parts with low and high friction coefficients in this paper. The results of finite element analysis studies show that the new type of smart friction damper enables large friction force in proportion to relative displacement between two ends of the damper and has a large allowable displacement to fit the demands of engineering applications. However, unlike the EDR by Nims and Kelly, this type of friction variable damper cannot self re-center. However, the lateral stiffness can be used to restore the structure. The nonlinear time history analysis of earthquake response for a structure equipped with the proposed friction variable dampers was carried out using the IDARC computer program. The results indicate that the proposed damper can successfully reduce the earthquake response of a structure.

关键词： friction variable damper energy dissipation restraint hysteretic performance finite element analysis nonlinear time history analysis

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3D star-like atypical hybrid MOF derived single-atom catalyst boosts oxygen reduction catalysis

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Journal of Energy Chemistry 2021年第4期30卷 355-360页

作者： Lei zhou peng zhou Yelong Zhang Bingyao Liu peng Gao Shaojun Guo BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China School of Applied Physics and Materials Wuyi UniversityJiangmen 529020GuangdongChina International Center for Quantum Materials and Electron Microscopy LaboratorySchool of PhysicsPeking UniversityBeijing 100871China

Developing high-efficiency,stable and non-precious electrocatalysts for oxygen reduction reaction(ORR)is highly important for energy conversion and *** atom catalysts(SACs)show good potential in enhancing ORR,however,the specifical control over the coordination surroundings around single metal center to intrinsically modify the electron structure is still a great ***,we demonstrate that a 3 D hybrid MOF composed of cobalt doped ZIF-L and ZIF-8,featuring star morphology with six equal branches,can be used as an advanced precursor for making the Co SACs for greatly boosted *** as-synthesized Co_(SA)-N-C exhibits excellent ORR activity with E_(1/2) of 0.891 V in alkaline medium,outperforming the commercial Pt/C by 39 m ***,the E_(1/2) of Co_(SA)-N-C(0.790 V)is merely 15 m V,less than that of Pt/C(0.805 V)in acid medium,which is among the best in the reported state-of-the-art *** calculations demonstrate that the enhanced ORR performance is assigned to the formation of atomically isolated cobalt atom coordinated three N atoms and one C atom,which is easier to decrease the free energy of rate determining step and accelerate the ORR process than that of traditional cobalt atom coordinated four N *** addition,a primary Zn-air battery with Co_(SA)-N-C cathode reveals a maximum power density of 92.2 m W cm^(-2) at 120.0 m A cm^(-2),far higher than that of commercial catalysts(74.2 m W cm^(-2) at 110.0 m A cm^(-2)).

关键词： Single atom catalysts Oxygen reduction reaction Metal-organic frameworks Zn-air battery

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A MODIFIED HSS ITERATION METHOD FOR SOLVING THE COMPLEX LINEAR MATRIX EQUATION AXB = C

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Journal of Computational Mathematics 2016年第4期34卷 437-450页

作者： Rong zhou XiangWang peng zhou Department of Mathematics School of Sciences Nanchang University Nanchang China Numerical Simulation and High-Performance Computing Laboratory School of Sciences Nanchang University Nanchang China

In this paper, a modified Hermitian and skew-Hermitian splitting （MHSS） iteration method for solving the complex linear matrix equation AXB = C has been presented. As the theoretical analysis shows, the MHSS iteration method will converge under cer- tain conditions. Each iteration in this method requires the solution of four linear matrix equations with real symmetric positive definite coefficient matrices, although the original coefficient matrices are complex and non-Hermitian. In addition, the optimal parameter of the new iteration method is proposed. Numerical results show that MHSS iteration method is efficient and robust.

关键词： MHSS iteration method HSS iteration method Linear matrix equation.

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